Get up to date with Marlin main branch - Precursor to "Create a build for testing the open sourced 3dChameleon Multi-Material Unit - marlin PR needs testing"

[tyeth]

Hey, just getting the ball rolling on this, what would be the difficulty in adding support for this PR:
MarlinFirmware/Marlin#24247

It effectively adds support for
github.com/3dchameleon/3DChameleonMk4
https://www.3dchameleon.com/

I haven't looked at this repo for a long time, no idea how behind our marlin fork is, presumably versions behind rather than close to main branch of marlin.